Precision spectroscopy by photon-recoil signal amplification

Abstract

Precision spectroscopy of atomic and molecular ions offers a window to new physics, but is typically limited to species with a cycling transition for laser cooling and detection. Quantum logic spectroscopy has overcome this limitation for species with long-lived excited states. Here, we extend quantum logic spectroscopy to fast, dipole-allowed transitions and apply it to perform an absolute frequency measurement. We detect the absorption of photons by the spectroscopically investigated ion through the photon recoil imparted on a co-trapped ion of a different species, on which we can perform efficient quantum logic detection techniques. This amplifies the recoil signal from a few absorbed photons to thousands of fluorescence photons. We resolve the line center of a dipole-allowed transition in 40Ca+ to 1/300 of its observed linewidth, rendering this measurement one of the most accurate of a broad transition. The simplicity and versatility of this approach enables spectroscopy of many previously inaccessible species.

25 pages, 6 figures, 1 table, updated supplementary information, fixed typos

References in corpus (5)

• QuTiP 2: A Python framework for the dynamics of open quantum systems
• Quantum computing with trapped ions
• Challenges of laser-cooling molecular ions
• Frequency Metrology on single trapped ions in the weak binding limit: The 3s1/2-3p3/2 transition in 24-Mg+
• Frequency metrology on the 4s 2S1/2 - 4p 2P1/2 transition in the calcium ion for a comparison with quasar data

Cited by in corpus (31)

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• Damage-free single-mode transmission of deep-UV light in hollow-core PCF
• Efficient sympathetic motional ground-state cooling of a molecular ion
• Part-per-billion measurement of the $4^2{S}_{1/2}\to 3^2{D}_{5/2}$ electric quadrupole transition isotope shifts between ${}^{42,44,48}$Ca${}^{+}$ and ${}^{40}$Ca${}^{+}$
• Sensing in the Presence of Observed Environments
• Sympathetic cooling of molecular ion motion to the ground state
• Quantum non-Gaussianity of light and atoms
• Experimental and theoretical investigation of a multi-mode cooling scheme using multiple EIT resonances
• Quantum non-Gaussianity of multi-phonon states of a single atom
• Criticality-enhanced Electric Field Gradient Sensor with Single Trapped Ions
• Detection of motional ground state population of a trapped ion using delayed pulses
• Quantum-Logic Detection of Chemical Reactions
• Decoherence-assisted spectroscopy of a single Mg${}^{+}$ ion
• Population dynamics in sideband cooling of trapped ions outside the Lamb-Dicke regime
• Direct Measurement of the Forbidden $2^3{S}_1\to 3^3{S}_1$ Atomic Transition in Helium
• Direct spectroscopy of the ${}^2$S${}_{1/2}{-}^2$P${}_{1/2}$ and ${}^2$D${}_{3/2}{-}^2$P${}_{1/2}$ transitions and observation of micromotion modulated spectra in trapped \Ca
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• Precision spectroscopy technique for dipole allowed transitions in laser cooled ions
• Zeeman-Splitting-Assisted Quantum Logic Spectroscopy of Trapped Ions
• Unresolved sideband photon recoil spectroscopy of molecular ions
• Ultrafast infrared spectroscopy with single molecular ions
• Photon Recoil Spectroscopy: Systematic Shifts and Nonclassical Enhancements
• Doppler Amplification of Motion of a Trapped Three-Level Ion
• Line search by quantum logic spectroscopy enhanced with squeezing and statistical tests